Application of CdSe@ZnS quantum dot fluorescence sensor in detection of copper ion pollution in water

doi:10.11949/0438-1157.20200324

Abstract

Abstract:

CdSe@ZnS core-shell quantum dots were continuously synthesized by using microfluidic technology. The surface of quantum dots was modified with mercaptopropionic acid to prepare water-soluble CdSe@ZnS core-shell quantum dots that can be quenched by copper ions. Subsequently, polyvinyl alcohol (PVA) hydrogel is used as a skeleton, and the modified quantum dots are loaded on the skeleton through hydrogen bonding force to obtain a composite fluorescent sensor device with simple preparation process and high thermal stability. The fluorescence intensity of the sensor has a linear negative correlation with the copper ion concentration in the aqueous solution, and the detection sensitivity can reach 20 μmol/L. Its simple operation and sensitive response make it complementary to the advantages of atomic absorption spectrophotometry. It is suitable for in situ detection of copper ion pollution in water. This loading method is universal, and provides a new way to apply other quantum dots to devices for the detection of certain metal ions, which achieves the purpose of rapid, recyclable and environmentally friendly detection of heavy metal ions.

Key words: microchannels, core-shell quantum dot, polymer, copper ion pollution, fluorescence sensor

摘要：

使用微流控技术连续合成CdSe@ZnS核壳型量子点，并使用巯基丙酸对其进行表面改性，制备出可以被铜离子淬灭的水溶性CdSe@ZnS核壳型量子点。随后以聚乙烯醇（PVA）水凝胶为骨架，将改性后的量子点通过氢键作用力负载于骨架上，得到制备工艺简单、热稳定性高的复合荧光传感器件。该传感器的荧光强度随水溶液中铜离子浓度呈线性负相关关系，检测灵敏度可达20 μmol/L。其简便的操作和敏感的响应使之与原子吸收分光光度法形成优势互补，适用于水体铜离子污染的原位检测。该负载方法具有一定普适性，提供了将任意量子点制成器件应用于某种金属离子检测的新方式，实现了可回收的、环境友好的重金属离子快速检测目的。

关键词: 微通道, 核壳型量子点, 聚合物, 铜离子污染, 荧光传感器

CLC Number:

O 649

ZHAO Xinyu, GENG Yuhao, TIAN Zhenhao, XU Jianhong. Application of CdSe@ZnS quantum dot fluorescence sensor in detection of copper ion pollution in water[J]. CIESC Journal, 2021, 72(2): 1142-1148.

赵心语, 耿宇昊, 田震昊, 徐建鸿. CdSe@ZnS量子点荧光传感器在水体铜离子污染检测中的应用[J]. 化工学报, 2021, 72(2): 1142-1148.

Figures/Tables 6

Fig.1 Diagram of microfluidics platform used for fabricating CdSe@ZnS

Fig.2 Characterization of CdSe @ ZnS before and after modification

Fig.3 Luminescent quenching effect of Cu2+ solution with different concentration

Fig.4 Schematic diagram of fluorescence response detection of composite gel film and electron micrograph of hydrogel network structure

Fig.5 TG curve of aqueous and dry compound hydrogel

Fig.6 Quantum dot-PVA composite film response to copper ions

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